The DMR would hurt it as well, since the 3x zoom and added precision would allow players on the top of the structure to hit attackers from their base with ease.
The idea that 343 could do something different with these maps because they're new - like including classic weapons - is interesting. I had assumed they were going to do some kind of update to provide the options to enable classic settins more precisely, such allowing damage for melee, weapon, and grenades to be adjusted one at a time (so classic won't have over power grenades in order to get a 4-shot kill, for instance).
Edit: the playlist update will "
very probably" come out today.